Tongues is not fruitful when spoken in public unless it's interpreted.
1 Cor 14:
5) I would that ye all spake with tongues, but rather that ye prophesied: for greater is he that prophesieth than he that speaketh with tongues, except he interpret, that the church may receive edifying.
13) Wherefore let him that speaketh in an unknown tongue pray that he may interpret.
Again, the context is speaking in tongues in meetings.
But if a person does not speak in tongues with the intent to interpret:
28) But if there be no interpreter, let him keep silence in the church; and let him speak to himself, and to God.
And if Paul thought that speaking in tongues was not fruitful, why did he say:
1 Cor 14:
5) I would that ye all spake with tongues.....,
14) For if I pray in an unknown tongue, my spirit prayeth, but my understanding is unfruitful.
15) What is it then? I will pray with the spirit, and I will pray with the understanding also: I will sing with the spirit, and I will sing with the understanding also.
18) I thank my God, I speak with tongues more than ye all:
39) Wherefore, brethren, covet to prophesy, and forbid not to speak with tongues.
18) Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints;
- Show all